Numerical Analysis on the Ground Settlement Induced by Shield Tunnel Construction

Abstract

Forecast and control of the deformation caused by stratum loss in the tunnel construction is one of the important research issues in the field of tunnel engineering. The ground settlement induced inevitably by shield tunnel excavation was taken as a study object. The process of the shield tunnel excavation was simulated by FEM, the variation of the stress and displacement field caused by tunnel excavation was analyzed, and the ground settlement induced by the stratum loss was studied. The ground settlement of the different soil constitutive equations and soil drained and undrained was compared, the sensitivity of the main influence factor of the ground settlement was analyzed. The results show that, the transverse distribution of the groove of the ground settlement is the same as the Gaussian’s distribution; main influence factors of the ground settlement are embedded depth, inner friction angle, modulus of compression, cohesion and Poisson ratio in file. The calculating model of the ground settlement induced by shield tunnel construction was proposed. And the correlation measures reducing the ground settlement and diminishing the badness influence on the surrounding environment can be taken.